VocabularyUnit 4 & 5

Equilateral/Equiangular Triangle

A triangle with 3 congruent sides and 3 congruent angles

Isosceles TriangleA triangle with 2 congruent sides

and 2 congruent angles

Scalene TriangleA triangle with no sides or angles

congruent

Obtuse TriangleA triangle with exactly one

obtuse angle

Right TriangleA triangle with exactly one right

angle

Interior AngleAn angle inside a triangle or

polygon

Exterior AngleAn angle outside a triangle or

polygon

Perpendicular BisectorA ray, line, or line segment that

is perpendicular to another line segment and goes through its midpoint

Angle BisectorA ray that divides an angle into 2

congruent angles

MedianA segment that connects a

vertex to the midpoint of the opposite side

AltitudeA segment from a vertex to the

opposite side that is perpendicular to that side

Represents the height of a polygon

Point of ConcurrencyThree or more lines intersecting

at a single (common) point

MidsegmentA segment that connects the

midpoints of the sides of a triangle

Parallel to the 3rd side and ½ its length